There is no clear indication that the term "yarn" has any specific meaning in the context of the Chandrayaan program. The name "Chandrayaan" itself is derived from Sanskrit, where "Chandra" means "moon" and "yaan" means "craft" or "vehicle". The spacecraft, rover, and rocket engine used in the Chandrayaan-3 mission are all named in Sanskrit as well. However, a LinkedIn post by the CEO of a company called "The Yarn Bazaar" used the term "Chandra-Yarn" in reference to the Chandrayaan-3 mission, but it is unclear what this term means or if it has any official significance. It is possible that "yarn" is simply a creative or colloquial term used by some individuals to refer to the mission, but it does not appear to have any official meaning or usage within the Chandrayaan program.